CN104897215B - It is a kind of can processing pressure signal and acoustic signals simultaneously sensor and its method - Google Patents
It is a kind of can processing pressure signal and acoustic signals simultaneously sensor and its method Download PDFInfo
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- CN104897215B CN104897215B CN201510389029.8A CN201510389029A CN104897215B CN 104897215 B CN104897215 B CN 104897215B CN 201510389029 A CN201510389029 A CN 201510389029A CN 104897215 B CN104897215 B CN 104897215B
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Abstract
The present invention relates to it is a kind of can processing pressure signal and acoustic signals simultaneously sensor and its method.The method includes：The raw electrical signal that acquisition is produced when being acted on by fluid medium pressure；The parallel static pressure signal and sound pressure signal for extracting fluid from the raw electrical signal；The static pressure signal of fluid and sound pressure signal to extracting carry out signal transacting to obtain pressure signal and acoustic signals respectively；The pressure signal and acoustic signals are exported respectively.The present invention obtains primary signal by pressure-sensitive component, static pressure signal and sound pressure signal are extracted from primary signal by parallelism wave filter, different signal transactings are carried out to static pressure signal and sound pressure signal respectively again, realize and processed while carrying out acoustic signals and pressure signal by same sensor, can reduces cost, workload can be reduced again, can be widely applied to the fields such as oil-gas pipeline, water process, Chemical Manufacture.
Description
Technical field
The present invention relates to sensor technical field, more particularly to it is a kind of can processing pressure signal and acoustic signals simultaneously biography
Sensor and its method.
Background technology
Sensor（EnglishTitle：transducer/sensor）It is a kind of detection means, measured letter can be experienced
Breath, and the information that will can be experienced, are for conversion into the information output of electric signal or other required forms according to certain rules, to meet
The transmission of information, treatment, storage, display, record and control etc. are required.
The characteristics of sensor, includes：Miniaturization, digitlization, intellectuality, multifunction, systematization, networking.It is to realize
Automatic detection and the primary link for automatically controlling.The presence and development of sensor, allow object to have tactile, taste and smell etc. to feel
Official, allows object slowly to become to have lived.It is divided into temperature-sensitive element, light-sensitive element, gas sensitive element generally according to its basic perceptional function
Part, force sensing element, magneto sensor, dew cell, acoustic sensor, radioactive ray sensing element, color sensor and quick element of taste etc. ten
Major class.
But the sensor all possesses same general character, a kind of data, such as pressure sensing can only be exactly detected and processed
Device can only be detected can only detect and process acoustic signals with processing pressure signal, sonic sensor, and biography is acted in fluid media (medium)
During sensor, the static pressure signal of fluid can be not only produced, also have the small sound pressure variations that fluid acoustic transmission causes, if
With two kinds of sensors take respectively detection and process, can also cost can improve, can also increase workload.
Based on above mentioned problem, a kind of energy how is designed and developed while the sensing of processing pressure signal and acoustic signals
Device, is problem in the urgent need to address at present.
The content of the invention
The purpose of the present invention aim to solve the problem that existing sensor can not processing pressure signal and acoustic signals simultaneously problem, from
And provide it is a kind of can processing pressure signal and acoustic signals simultaneously sensor and its method.
In a first aspect, the invention provides a kind of sensor while the method for processing pressure signal and acoustic signals.Should
Method is comprised the following steps：The raw electrical signal that acquisition is produced when being acted on by fluid medium pressure；From the raw electrical signal
The parallel static pressure signal and sound pressure signal for extracting fluid；The static pressure signal of fluid and sound pressure signal to extracting enter respectively
Row signal transacting is obtaining pressure signal and acoustic signals；The pressure signal and acoustic signals are exported respectively.
Preferably, the acquisition of the raw electrical signal is realized by the pressure-sensitive component in the sensor.
Preferably, the extraction of the static pressure signal realized by the low pass filter in the sensor, the acoustic pressure
The extraction of signal is realized by the bandpass filter in the sensor.
Preferably, the output of the pressure signal is realized that the sound wave is believed by the pressure sensor in the sensor
Number output realized by the sonic sensor in the sensor.
Preferably, the described pair of static pressure signal for extracting and sound pressure signal carry out signal transacting to obtain pressure letter respectively
Number and acoustic signals specifically include：
The static pressure signal that will be extracted is pressed after carrying out preposition amplification, LPF, rearmounted amplification and driving treatment
Force signal；
The acoustic signals that will be extracted are obtained after carrying out preposition amplification, gain control, rearmounted amplification and bandpass filtering treatment
Acoustic signals.
In second aspect, the invention provides it is a kind of can processing pressure signal and acoustic signals simultaneously sensor.The biography
Sensor includes：The signal acquiring unit of the raw electrical signal produced when being acted on by fluid medium pressure for obtaining；With the letter
Number acquiring unit is connected, the static pressure signal extraction list of the static pressure signal for extracting fluid from the raw electrical signal
Unit and the sound pressure signal extraction unit of extraction sound pressure signal；It is connected with the static pressure signal extraction unit, for extracting
The static pressure signal of the fluid for going out carries out signal transacting to obtain the pressure signal processing unit of pressure signal, and with the acoustic pressure
Signal extraction unit is connected, and the sound pressure signal for the fluid to extracting carries out signal transacting to draw the sound of acoustic signals
Ripple signal processing unit；It is connected with the pressure signal processing unit, the pressure signal for exporting the pressure signal is defeated
Go out unit, and be connected with the acoustic signals processing unit, the acoustic signals output unit for exporting the acoustic signals.
Preferably, the signal acquiring unit is the one kind in following Sensitive Apparatus:
Strain-type pressure-sensitive component, piezoelectric pressure Sensitive Apparatus or pressure drag type pressure Sensitive Apparatus.
Preferably, the static pressure signal extraction unit is low pass filter, and the sound pressure signal extraction unit is band logical
Wave filter.
Preferably, the pressure signal processing unit includes preamplifier, low pass filter, post amplifier and driving
Circuit；The acoustic signals processing unit includes preamplifier, gain controller, post amplifier and bandpass filter.
Preferably, the pressure signal output unit is pressure sensor, and the acoustic signals output unit is passed for sound wave
Sensor.
Beneficial effects of the present invention：The present invention by pressure-sensitive component acquisition primary signal, by parallelism wave filter from
Extract static pressure signal and sound pressure signal in primary signal, then different letters are carried out to static pressure signal and sound pressure signal respectively
Number treatment, realizes and is processed while same sensor carries out acoustic signals and pressure signal, can reduces cost, can subtract again
Few workload, can be widely applied to the fields such as oil-gas pipeline, water process, Chemical Manufacture.
Brief description of the drawings
Fig. 1 be it is according to embodiments of the present invention can the sensor of processing pressure signal and acoustic signals simultaneously structural representation
Figure；
Fig. 2 is sensor according to embodiments of the present invention while the method flow diagram of processing pressure signal and acoustic signals；
Fig. 3 is the raw electrical signal schematic diagram obtained by pressure-sensitive component in inventive sensor；
Fig. 3 A are that the pressure signal schematic diagram after LPF is carried out to the raw electrical signal in Fig. 3；
Fig. 3 B are that the pressure signal schematic diagram after preposition amplification is carried out to the low-pass filter signal in Fig. 3 A；
Fig. 3 C be to Fig. 3 B in preposition waveform amplification carry out the signal schematic representation after low-pass filtering treatment；
Fig. 3 D be to Fig. 3 C in preposition amplification filtering process after pressure signal carry out the pressure signal after rearmounted amplification
Schematic diagram；
Fig. 3 E be to Fig. 3 D in rearmounted amplification after pressure signal be driven after pressure signal schematic diagram；
Fig. 3 F are that the acoustic signals schematic diagram after bandpass filtering is carried out to the raw electrical signal in Fig. 3；
Fig. 3 G are that the acoustic signals after the bandpass filtering treatment in Fig. 3 F are carried out with the signal of the acoustic signals after preposition amplification
Figure；
Fig. 3 H be to Fig. 3 G in preposition amplification after acoustic signals carry out the acoustic signals schematic diagram after gain control；
Fig. 3 I are to carry out the acoustic signals schematic diagram after rearmounted amplification to the acoustic signals after the gain control in Fig. 3 H；With
And
Fig. 3 J be to Fig. 3 I in rearmounted amplification after acoustic signals carry out the acoustic signals after bandpass filtering treatment signal
Figure.
Specific embodiment
In order that those skilled in the art are better understood from the technical scheme in the embodiment of the present invention, and make of the invention real
Applying the above-mentioned purpose of example, feature and advantage can be more obvious understandable, below by drawings and Examples, to technology of the invention
Scheme is described in further detail.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of all other embodiment for being obtained, belong to the scope of protection of the invention.
Fig. 1 be it is according to embodiments of the present invention can be while gathering the structural representation of the sensor of pressure data and sonic data
Figure.
As shown in figure 1, the sensor of the embodiment includes：Signal acquiring unit, static pressure signal extraction unit, acoustic pressure letter
Number extraction unit, pressure signal processing unit, acoustic signals processing unit, pressure signal output unit and sound wave signal output list
Unit.
Signal acquiring unit is responsible for obtaining the raw electrical signal produced when being acted on by fluid medium pressure.Present invention selection spirit
Sensitivity is high, the big pressure-sensitive component of bandwidth of operation.According to actual conditions needs, pressure sensitive material can be selected：Strain-type
Pressure-sensitive component, piezoelectric pressure Sensitive Apparatus or pressure drag type pressure Sensitive Apparatus.Fluid medium pressure acts on pressure
During Sensitive Apparatus, raw electrical signal will be produced.The raw electrical signal that pressure-sensitive component is obtained both had included the static pressure of fluid
Signal, also includes the small sound pressure variations that fluid acoustic transmission causes.The raw electrical signal that pressure-sensitive component is obtained is visible
Shown in Fig. 3.
Static pressure signal extraction unit extracts the static pressure signal of fluid from above-mentioned raw electrical signal, and sound pressure signal is extracted
Unit extracts the sound pressure signal of fluid from above-mentioned raw electrical signal.Static pressure signal extraction unit is chosen in the embodiment of the present invention
Low pass filter realizes the extraction of fluid media (medium) pressure（Shown in the visible Fig. 3 A of pressure signal after LPF）, sound pressure signal
Extraction unit chooses bandpass filter to realize the extraction of fluid media (medium) acoustic pressure（The visible Fig. 3 F institutes of acoustic signals after bandpass filtering
Show）.
The static pressure signal of fluid of the pressure signal processing unit to extracting carries out signal transacting to obtain pressure signal.
The sound pressure signal of fluid of the acoustic signals processing unit to extracting carries out signal transacting to obtain acoustic signals.
Specifically, pressure signal processing unit includes preamplifier, low pass filter, post amplifier and drives electricity
Road.The raw electrical signal of pressure-sensitive component output is very faint, and internal resistance is very high, by that must be selected after low pass filter
Suitable preamplifier.Preamplifier Main Function is：The weak voltage signals of amplification low pass device output；High resistant
Anti- output transform is Low ESR output (the premenstrual pressure signal put after enhanced processing is as shown in Fig. 3 B).By after preposition amplification
Voltage signal reflects the situation of change of pressure, to improve signal to noise ratio, reduces circuit interference effect, reuses low pass filter
The HFS of signal is filtered, the low frequency part for leaving embodies the pressure (pressure after low-pass filtered treatment of fluid media (medium)
Shown in signal as Fig. 3 C).The voltage signal for filtering output needs to carry out rearmounted amplification, so that output level is protected with subsequent conditioning circuit
Hold good matching.Post amplifier may amplify the signal to sufficiently large, and peak value is limited in into certain scope (through rearmounted simultaneously
Shown in pressure signal as Fig. 3 D after enhanced processing).Standard pressure transducer generally have 0~5V, -5~+5V, 0~
The canonical forms such as 10V, -10V~+10V, 0~20mA, 4~20mA are exported.Accordingly, it would be desirable to using drive circuit by rearmounted amplification
The output driving of device is exported to canonical form（Shown in the visible Fig. 3 E of pressure signal after driving）.The electric signal of drive circuit output
By obtaining pressure signal after demarcation.
Specifically, acoustic signals processing unit includes preamplifier, gain controller, post amplifier and bandpass filtering
Device.When sound wave is propagated in fluid media (medium), due to the vibration of fluid media (medium), instantaneous pressure and the static pressure of medium can be produced necessarily
Difference, the difference is referred to as acoustic pressure.The unit of acoustic pressure is Pa.Sound pressure level is the function of time.When generally using, acoustic pressure is effective
The abbreviation of acoustic pressure.Acoustic pressure is distributed in sound field with certain space.Pressure-sensitive component is pressurized produces original telecommunications in media as well
Number.The dynamic part of raw electrical signal reflects the sound pressure variations of fluid media (medium).Different according to vibration frequency, sound wave can be divided into：
Audible sound, people are the mechanical wave call sound wave that can cause the sense of hearing（Audio）.Frequency is between 20~20000Hz.Infrasound,
Mechanical wave of the frequency less than 20Hz is referred to as infrasound.Ultrasonic wave, mechanical wave of the frequency higher than 20000Hz is referred to as ultrasonic wave.
Due to the limitation of pressure-sensitive component bandwidth of operation, by selecting different wave filters, exportable audible sound of the invention
Ripple and infrasound signal.When the passband of bandpass filter is 0~below 20Hz, system output infrasound signal；When band logical filter
When the passband of ripple device is 20~20000Hz, system output audible sound signal.
The raw electrical signal of pressure-sensitive component output（As shown in Figure 3）It is very faint, and internal resistance is very high, by band logical
Acoustic signals (shown in the visible Fig. 3 F of acoustic signals figure after bandpass filtering) after wave filter is filtered must be selected suitably
Preamplifier, the preamplifier Main Function of sound pressure signal processing unit is：Amplify the faint electricity of bandpass filter output
Pressure signal；High impedance output is transformed to Low ESR output（Shown in acoustic signals as Fig. 3 G after preposition amplification）.Bandpass filtering
The acoustic signals strength ratio pressure signal of device output is also faint, usually microvolt rank.For more preferably obtain acoustic signals, it is necessary to
Selection noise level is low, the larger preamplifier of gain.
The dynamic range of acoustic signals is larger, is more preferable control signal amplitude, it is necessary to right after preamplifier output
Signal carries out gain control.Gain is controlled（gain control）The gain of amplifying circuit is set to be adjusted with signal intensity.Gain
The efficient combination amplified using Linear Amplifer and compression is controlled to be adjusted the output signal of preamplifier.When weak signal is defeated
It is fashionable, linear amplifier circuit work, it is ensured that the intensity of output signal；When input signal reaches some strength, start compression and put
Big circuit, reduces output amplitude（Shown in acoustic signals as Fig. 3 H after gain control）.
The voltage signal of gain controller output needs to carry out rearmounted amplification, so that output level and subsequent conditioning circuit（Such as
AD sample circuits etc.）Keep good matching.Post amplifier may amplify the signal to sufficiently large, and peak value is limited in into one simultaneously
Fixed scope（Shown in acoustic signals as Fig. 3 I after rearmounted amplification）.
Strengthened by the acoustic signals intensity after rearmounted amplification, preferably reflected sound pressure variations, to improve signal to noise ratio,
Reduce circuit noise influence, reuse the noise signal outside bandpass filter filters passband, the signal for leaving is exactly noise
Compare acoustic signals high (shown in the acoustic signals as Fig. 3 J after bandpass filtering）.
The output of pressure signal output unit is above-mentioned premenstrual to put big, LPF, rearmounted amplification and obtains after driving
Pressure signal；Acoustic signals output unit exports the big premenstrual storing of above-mentioned sound pressure signal, gain control, rearmounted amplification and filters it
After obtain continuous sound wave signal.In embodiments of the present invention, pressure signal output unit is pressure sensor, acoustic signals output
Unit is sonic sensor.
Fig. 2 is the method flow diagram that sensor according to embodiments of the present invention gathers pressure data and sonic data simultaneously.
In step 201, what is produced when being obtained and acted on by fluid medium pressure by the pressure-sensitive component in sensor is original
Electric signal.
Fluid is extracted by the low pass filter in sensor in step 202, the raw electrical signal from step 201
Static pressure signal, sound pressure signal is extracted by the bandpass filter in sensor.
In step 203, the static pressure signal of fluid and sound pressure signal that are extracted in step 202 are carried out at signal respectively
Manage to obtain pressure signal and acoustic signals.
Signal transacting is carried out to the static pressure signal and sound pressure signal that extract respectively and is believed with obtaining pressure signal and sound wave
Number specifically include：
The static pressure signal that will be extracted is pressed after carrying out preposition amplification, LPF, rearmounted amplification and driving treatment
Force signal；
The sound pressure signal that will be extracted is obtained after carrying out preposition amplification, gain control, rearmounted amplification and bandpass filtering treatment
Acoustic signals.
In step 204, the pressure signal for obtaining is processed through step 203 by the output of sensor pressure sensor, by sound wave
Sensor output processes the acoustic signals for obtaining through step 203.
As described above, inventive sensor can be used to solve pressure signal and acoustic signals can not to be processed with same sensor
Problem.Can process two kinds of data using a kind of sensor, so can reduces cost, again reduce workload.And the present invention
Sensor also there is compact conformation, precision advantage higher can be widely applied to oil-gas pipeline, water process, Chemical Manufacture etc.
Industry.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that and the foregoing is only specific embodiment of the invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. all should include
Within protection scope of the present invention.
Claims (5)
1. a kind of sensor is while the method for processing pressure signal and acoustic signals, it is characterised in that comprise the following steps：
The raw electrical signal produced when being obtained and acted on by fluid medium pressure by the pressure-sensitive component in the sensor；
Fluid is extracted by the low pass filter and bandpass filter in the sensor are parallel from the raw electrical signal respectively
Static pressure signal and sound pressure signal；
The static pressure signal of fluid and sound pressure signal to extracting carry out signal transacting to obtain pressure signal and sound wave respectively
Signal, specifically includes:After the static pressure signal that will be extracted carries out preposition amplification, LPF, rearmounted amplification and driving treatment
Obtain pressure signal；The static pressure signal that will be extracted carries out impedance matching, preposition amplification, gain control, rearmounted amplification and band
Acoustic signals are obtained after pass filter treatment；
The pressure signal and acoustic signals are exported by the pressure sensor and sonic sensor in the sensor respectively.
2. method according to claim 1, it is characterised in that the output of the pressure signal is by the pressure in the sensor
Force snesor realizes that the output of the acoustic signals realized by the sonic sensor in the sensor.
3. it is a kind of can processing pressure signal and acoustic signals simultaneously sensor, it is characterised in that including：
The signal acquiring unit of the raw electrical signal produced when being acted on by fluid medium pressure is obtained, the signal acquiring unit is
Pressure-sensitive component；
It is connected with the signal acquiring unit, the static pressure of the static pressure signal for extracting fluid from the raw electrical signal
The sound pressure signal extraction unit of signal extraction unit and extraction sound pressure signal；The static pressure signal extraction unit is LPF
Device, the sound pressure signal extraction unit is bandpass filter；
It is connected with the static pressure signal extraction unit, the static pressure signal for the fluid to extracting carries out signal transacting
To obtain the pressure signal processing unit of pressure signal, and it is connected with the sound pressure signal extraction unit, for extracting
The sound pressure signal of fluid signal transacting is carried out to draw the acoustic signals processing unit of acoustic signals, the pressure signal treatment
Unit includes preamplifier, low pass filter, post amplifier and drive circuit；The acoustic signals processing unit includes preceding
Put amplifier, gain controller, post amplifier and bandpass filter；
It is connected with the pressure signal processing unit, the pressure signal output unit for exporting the pressure signal, and with
The acoustic signals processing unit is connected, the acoustic signals output unit for exporting the acoustic signals.
4. sensor according to claim 3, it is characterised in that during the signal acquiring unit is following Sensitive Apparatus
It is a kind of:
Strain-type pressure-sensitive component, piezoelectric pressure Sensitive Apparatus or pressure drag type pressure Sensitive Apparatus.
5. sensor according to claim 3, it is characterised in that the pressure signal output unit is pressure sensor,
The acoustic signals output unit is sonic sensor.
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